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.TH PCPCOMPAT 1 "PCP" "Performance Co-Pilot"
.SH NAME
\f3PCPCompat\f1,
\f3pcp-collectl\f1,
\f3pmmgr\f1,
\f3pmwebd\f1 \- backward-compatibility in the Performance Co-Pilot (PCP)
.SH INTRODUCTION
The Performance Co-Pilot (PCP) is a toolkit designed for monitoring
and managing system-level performance.
These services are distributed and scalable
to accommodate the most complex system configurations and performance
problems.
.PP
In order to achieve these goals effectively, protocol and on-disk
compatibility is provided between different versions of PCP.
It is feasible (and indeed encouraged) to use current PCP tools to
interrogate any remote, down-rev or up-rev
.BR pmcd (1)
and also to replay any historical PCP archive (the PCP testsuite
includes PCP archives created over 20 years ago!).
.PP
From time to time the PCP developers deprecate and remove PCP utilities,
replacing them with new versions of utilities providing comparable features.
This page describes replacement utilities for historical PCP tools.
.SH PMLOGCONF-SETUP
Earlier versions of PCP (prior to v5.1.1) provided a shell script that
was used internally by
.BR pmlogconf (1),
located in the
.B PCP_BINADM_DIR
directory, named
.BR pmlogconf-setup .
This script has been retired.
The equivalent functionality remains available in the unlikely event
it should be needed via the \fB\-s\fR or \fB\-\-setup\fR option to
.BR pmlogconf (1).
.PP
The version 1
.B pmlogconf-setup
configuration file format (from IRIX) was also retired in this release,
after more than 10 years of automatic transition to version 2 format by
.BR pmlogconf .
.SH PMMGR
The standalone PCP daemon manager
.B pmmgr
has been retired from PCP v5.2.0 onward.
It was phased out in favour of the simpler
.BR pmfind (1)
service for setting up
.BR pmie (1)
and
.BR pmlogger (1)
``farms'' of discovered PCP collector systems with
.BR pmfind_check (1).
The new mechanisms, especially when integrated with
.BR systemd ,
require no additional daemons and are better integrated with the
.BR pmie
and
.BR pmlogger
service management used elsewhere in PCP.
.SH PCP-COLLECTL
The
.B pcp-collectl
utility has been superceded by
.BR pmrep (1)
from PCP v5 onward.
.PP
The equivalent of
.B pcp-collectl
subsystem reporting is achieved as follows:
.TP
.B pmrep :collectl-sc
Processor subsystem view.
.TP
.B pmrep :collectl-sm
Memory subsystem view.
.TP
.B pmrep :collectl-sd
Aggregate disks view.
.TP
.B pmrep :collectl-sD
Per-disk-device view.
.TP
.B pmrep :collectl-dm-sD
Device mapper view.
.TP
.B pmrep :collectl-sn
Network subsystem view.
.SH PCP-WEBAPPS
The standalone web applications packaged with older PCP versions
have been superceded by
.BR grafana-server (1)
with the
.B grafana-pcp
plugin
.BR https://github.com/performancecopilot/grafana-pcp .
.PP
This plugin provides an implementation of the Vector application,
as well as data sources for
.BR pmdabpftrace "(1) ("\c
.BR bpftrace (8)
scripts) and
.BR pmseries (1)
(fast, scalable Redis-based time series analysis).
.SH PMWEBD
The
.B pmwebd
daemon has been superceded by
.BR pmproxy (1)
from PCP v5 onward.
.PP
By default,
.B pmproxy
will now listen on both its original port (44322) and the PCP
web API port (44323) when the time series support is built.
.PP
.B pmproxy
provides a compatible implementation of the live
.BR PMWEBAPI (3)
interfaces used traditionally by the Vector web application
(see the ``PCP-WEBAPPS'' section).
It also provides extensions to the original
.B pmwebd
REST APIs (such as derived metrics, namespace lookups and instance
domain profiles), support for the HTTPS protocol, and fast, scalable
time series querying using the
.BR pmseries (1)
REST API and
.BR redis-server (1).
.PP
The partial Graphite API emulation provided by
.B pmwebd
has not been re-implemented \- applications wishing to use similar
services could use the scalable time series REST APIs described on
.BR PMWEBAPI (3).
.SH SEE ALSO
.BR pcp (1),
.BR pmcd (1),
.BR pmrep (1),
.BR pmfind (1),
.BR pmfind_check (1),
.BR pmlogconf (1),
.BR pmproxy (1),
.BR pmseries (1),
.BR pmdabpftrace (1),
.BR redis-server (1),
.BR grafana-server (1)
and
.BR PMWEBAPI (3).
